/* ==========================================================================
   jannalu.com - Styles
   Design Philosophy: "Classy, Understated, Light"
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */

:root {
  /* Color Palette */
  --color-bg: #FDFCFB;
  --color-text-primary: #2E2E38;
  --color-text-secondary: #6B5E5A;
  --color-link: #7B68A8;
  --color-link-hover: #5D4E8C;
  --color-border: rgba(107, 94, 90, 0.15);

  /* Typography */
  --font-headers: 'Fraunces', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;

  --size-h1: clamp(32px, 5vw, 42px);
  --size-h2: clamp(24px, 4vw, 32px);
  --size-h3: clamp(20px, 3vw, 24px);
  --size-body: clamp(16px, 2.5vw, 18px);
  --size-nav: 16px;
  --size-small: 14px;

  --line-height-body: 1.6;
  --line-height-headers: 1.25;
  --letter-spacing-body: 0.01em;

  /* Spacing */
  --content-max-width: 700px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
}

/* --------------------------------------------------------------------------
   Reset & Base Styles
   -------------------------------------------------------------------------- */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--size-body);
  font-weight: 400;
  line-height: var(--line-height-body);
  letter-spacing: var(--letter-spacing-body);
  color: var(--color-text-primary);
  background-color: var(--color-bg);
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */

h1, h2, h3 {
  font-family: var(--font-headers);
  font-weight: 600;
  line-height: var(--line-height-headers);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--size-h1);
}

h2 {
  font-size: var(--size-h2);
}

h3 {
  font-size: var(--size-h3);
  font-weight: 500;
}

p {
  margin-bottom: var(--spacing-sm);
}

p:last-child {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Links
   -------------------------------------------------------------------------- */

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--transition-fast),
              text-decoration-color var(--transition-fast);
  text-underline-offset: 3px;
}

a:hover,
a:focus {
  color: var(--color-link-hover);
  text-decoration: underline;
  text-decoration-color: var(--color-link-hover);
}

a:focus-visible {
  outline: 2px solid var(--color-link);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

.page-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.content-wrapper {
  width: 100%;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

main {
  flex: 1;
}

/* --------------------------------------------------------------------------
   Skip Link (Accessibility)
   -------------------------------------------------------------------------- */

.skip-link {
  position: absolute;
  top: -100%;
  left: -100%;
  background: var(--color-text-primary);
  color: var(--color-bg);
  padding: var(--spacing-xs) var(--spacing-sm);
  z-index: 100;
}

.skip-link:focus {
  top: 0;
  left: 0;
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */

.site-header {
  padding: var(--spacing-lg) 0 var(--spacing-md);
}

.site-header .content-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.site-header.header-right .content-wrapper {
  justify-content: flex-end;
}

.site-title {
  font-family: var(--font-headers);
  font-size: var(--size-nav);
  font-weight: 600;
}

.site-title a {
  color: var(--color-text-primary);
}

.site-title a:hover {
  color: var(--color-link-hover);
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: var(--spacing-md);
}

.site-nav a {
  font-size: var(--size-nav);
  font-weight: 400;
  padding: var(--spacing-xs) 0;
}

.site-nav a[aria-current="page"] {
  font-weight: 500;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-decoration-color: var(--color-link);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.site-footer {
  padding: var(--spacing-lg) 0;
  margin-top: auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.footer-links a {
  font-size: var(--size-small);
  color: var(--color-text-secondary);
}

.footer-links a:hover {
  color: var(--color-link-hover);
}

/* --------------------------------------------------------------------------
   Homepage Styles
   -------------------------------------------------------------------------- */

.intro {
  padding: var(--spacing-xl) 0;
}

.intro h1 {
  margin-bottom: var(--spacing-xs);
}

.tagline {
  font-size: var(--size-body);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.social-links {
  font-size: var(--size-small);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

.social-links a {
  color: var(--color-link);
}

.social-links a:hover {
  color: var(--color-link-hover);
}

.social-links .separator {
  margin: 0 0.4em;
  color: var(--color-text-secondary);
  opacity: 0.5;
}

.bio {
  margin-bottom: var(--spacing-lg);
}

.currently {
  padding: var(--spacing-lg) 0;
}

.currently h2 {
  margin-bottom: var(--spacing-md);
}

/* --------------------------------------------------------------------------
   Research Page Styles
   -------------------------------------------------------------------------- */

.page-title {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.research-section {
  margin-bottom: var(--spacing-xl);
}

.research-section h2 {
  margin-bottom: var(--spacing-md);
}

/* Publication List */
.publication-list {
  list-style: none;
}

.publication {
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.publication:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.publication-title {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  color: var(--color-link);
}

a.publication-title:hover {
  color: var(--color-link-hover);
}

/* Working papers - compact without borders */
.working-papers .publication {
  margin-bottom: var(--spacing-sm);
  padding-bottom: 0;
  border-bottom: none;
}

.working-papers .publication-title {
  margin-bottom: 0;
}

.publication-authors {
  display: block;
  font-size: var(--size-small);
  color: var(--color-text-secondary);
  margin-bottom: 2px;
}

.publication-authors strong {
  font-weight: 600;
  color: var(--color-text-primary);
}

.publication-venue {
  display: block;
  font-size: var(--size-small);
  color: var(--color-text-secondary);
  font-style: italic;
}

.publication-meta {
  display: block;
  font-size: var(--size-small);
  color: var(--color-text-secondary);
}

.publication-links {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xs);
}

.publication-links a {
  font-size: var(--size-small);
}

/* Awards List */
.awards-list {
  list-style: none;
}

.awards-list li {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-md);
  position: relative;
}

.awards-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 4px;
  height: 4px;
  background-color: var(--color-link);
  border-radius: 50%;
}

/* --------------------------------------------------------------------------
   CV Page Styles
   -------------------------------------------------------------------------- */

.cv-page .page-title {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.cv-download a {
  font-size: var(--size-small);
  font-weight: 500;
}

.pdf-viewer {
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.pdf-viewer iframe {
  width: 100%;
  height: 80vh;
  min-height: 600px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: white;
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */

@media (max-width: 600px) {
  :root {
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
  }

  .site-header .content-wrapper {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }

  .site-nav {
    gap: var(--spacing-md);
  }

  .site-nav a {
    padding: var(--spacing-xs) var(--spacing-xs);
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }

  .footer-links {
    justify-content: center;
    gap: var(--spacing-sm);
  }
}

@media (min-width: 601px) and (max-width: 900px) {
  .content-wrapper {
    padding: 0 var(--spacing-lg);
  }
}

/* --------------------------------------------------------------------------
   Reduced Motion
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* --------------------------------------------------------------------------
   Print Styles
   -------------------------------------------------------------------------- */

@media print {
  body {
    background: white;
    color: black;
  }

  .site-nav,
  .site-footer {
    display: none;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }

  .page-container {
    min-height: auto;
  }
}